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    The computers on the network can communicate with each other as well as work independently.
                      Each computer in a network is called a node. The computers in the network maybe linked through

                      a cable, hub, switch, NIC (Network Interface Card), modem or router.
                      There are different kinds of computer networks that work in different ways. Networks may be
                      very small and simple or they may be complex as a global network like the Internet. There may
                      be wired or wireless connection between computers on the network.

                            NEED FOR COMPUTER NETWORK

                      Computers and other devices connected on a network help in:
                          Resource Sharing: It helps the users to share files and hardware devices such as printers,
                          scanners, etc.

                          Communication: It helps us to communicate with others through e-mail, video conference,
                          instant messaging, etc.

                            ADVANTAGES OF COMPUTER NETWORK

                      The advantages of computer network are:
                          The information can be easily shared by people.
                          It reduces the cost of hardware.

                          Store information in one centralised location.
                          Reliability implies backing up of information. If a system crashes, then the information is
                          accessible on another workstation for future use.
                          Reduction in installation cost.
                          User authentication process to secure the data.

                          People will have access to all the information they need to get and share through e-mails
                          and instant messaging which saves time and money in passing information.
                            DISADVANTAGES OF COMPUTER NETWORK

                      The disadvantages of computer network are:

                          The cost of setting up a network can be high, especially when a number of computers are to
                          be connected. Expensive devices such as servers, routers, switches, hubs and so on have to
                          be purchased.
                          If the server breaks down, the files on it become inaccessible.
                          Viruses and malware can spread easily through a computer network.

                          There is increased danger of hacking of computers on a network. Hacking is done by someone
                          without the permission of the user to view, copy and create data on their computer. A firewall
                          can be used to prevent such activities.
                            COMPONENTS OF A COMMUNICATION SYSTEM

                      There are mainly five components of a communication system which are as follows:

                          Sender: A sender is a device (usually a computer) that wants to send information to other
                          computer connected to the network.

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